Answer to cable and wire - TANO CABLE

A High voltage power cable is a kind of cable used in special occasion, we should obey operation rules strictly when using, once accidents happened, the consequences are very serious. High voltage power cable once watered, under the influence of electric field, aging will occur, leading to cable breakdown. In the practical application of high voltage power cable, the solution to high voltage power cable watering is as following: 1. If the cable end has water, the front end can amputate a few meters of the cable. 2. If the entire cable has water, can only be scrapped. So how to prevent high voltage power cable water is crucial, usually take the following measures: 1, The high-voltage power cable should be sealed up, if it is amputated the end of the cable, either stacked or laid up, the cable all should be sealed with plastic so as to prevent moisture penetration. 2, High voltage power cable must make cable joints and terminations timely after cable laying, which can effectively prevent cable watering from the cable end. 3, When purchase high voltage power cable, you must select a good quality cable (such as Tano Cable), can effectively prevent cable insulation aging and other conditions. 4, The Insulation impurities and porosity of high voltage power cable is the starting point for the movement of water molecules, so the cable must be regular maintenance when using.  A High voltage electric cable water, generally because of three reasons: 1. In the cable production process, the inner liner pull extrusion unglued or loopholes, watering when the water cooled sink, production workers did not pay attention, or found it but not timely handled it. (If the water in the production process, the finished cable partial discharge test is greater than the index inevitable 10pC, cable is impossible qualified) 2. After high voltage electric cable produced, cable end sealing cap is not ready, place in the open air and rain water into the internal cables. 3. When high voltage electric cable laying, cable has been truncated, but neither made cable terminal head in time, nor bandage sealed. With watered in cable trench, resulting in an unsealed cable water. For XLPE high voltage electric cable, the cable inside watered, especially the water inside the inner liner, it is very dangerous, because XLPE insulation afraid of water, under the influence of high voltage electric field, the water will make XLPE insulation water trees again produce electrical trees, resulting in cable insulation breakdown.   If the water is caused by the cable manufacturer, you can contact the manufacturer to replace the cable to ensure proper use of the cable.   If the result of improper storage or water due to construction negligence, vacuum methods can be used to drain the water in the cable, that is, to do with the cable inlet section of the valve core cable sealing cap, the inner core removed, sealing cap with the cable jacket seal with a vacuum pump and valve core connection, pumping out the water inside the cable; the other end of the cable to do the same sealing cap (with the valve core) and add a valve, internal cable to be evacuated to a certain degree of vacuum, dry air into the valve opening. Vacuum - the intake valve open - close the vacuum valve - open the intake valves - vacuum ........ this is repeated several times until the internal cables damp parts dry. Too much trouble, but there is no other good way. Practice has proved that this approach is indeed feasible. A 1. Appearance of building wire Smooth and round, uniform color, rubber insulation and copper conductor closely difficult to peel, bad quality rubber insulation looks thick, but after squeezing, the squeeze point will turn into white, it is easy for cable aging and fall off lead to electric leakage loss in the future. 2.Eccentricity ratio of building wire Thickness of every rubber insulation circle is consistent, that is, whether the copper core in the middle of building wire, the eccentricity ratio is low. 3.Retardant of building wire Burned rubber insulation with a lighter, the fire should be extinguished when lighter left the wire, and release of a small amount of white smoke, if the flames spread, release large amounts of white smoke indicates the rubber insulation is poor quality.   4. Copper core of building wire High purity copper core is with features of anti-aging, high conductivity, and inferior copper core is with color yellow or white, with impurities. You can use a piece of paper rubbing on the copper core, if there is a black substance on the white paper, indicates impurities in the copper core . 5. Mark of building wire You should notice whether the wire is with Certification of Quality, "CCC" sign, complete information on the rated voltage, length, date, manufacturer name and address etc.   6. Thickness of building wire The size of poor quality copper core is smaller than regular factory, Good quality copper core insulation is thick, and  wire section diameter deviation should not be exceed 0.02%.   7. Length of building wire Length of building wire should meet the national standard 100 ± 0.5m (That is take 100m as standard, permissible error 0.5 meters). 8. Weight of building wire The whole plate building wire (100m), 1.5mm2 is not less than g, 2.5 square is not less than g, 4 square is not less than g, 6 mm2 is not less than g.   A Selection steps and principles of Marine Cable 1. According to the application, laying location, and working conditions of marine cable to select the appropriate marine cable. 2.  According to the duty, power type, cable core and load current of electrical equipment to select the appropriate cable cross-section. 3.  According to system short-circuit current calculations, determine whether the cable short-circuit capacity to meet the requirements. 4.  According to ambient temperature to amend the rated ampacity, and then determine whether the cable allowable current is greater than the load current. 5.  According to bunched laying correction factor to amend the rated ampacity, and then determine whether the cable allowable current is greater than the load current. 6.  Check line voltage drop, and determine whether the line voltage drop is less than the predetermined value. 7.  According to the setting value of the protection device to determine whether the cable is coordinate with protection device; if uncoordinated, determine whether you can change the appropriate protective devices or setting value, or you should re-select the appropriate cable cross-section. Marine cable type selection should consider the following factors: 1.    Application of the marine cable-- for power, lighting or radio communications. 2.    Cabling position of marine cable --- dry, wet, cold, or whether requiring shielding. 3.    Working conditions of marine cable --- fixed laying, pipe wear or portable Tano cable is professional marine cables manufacturer with more than 20 years experience, our Maine cable is high-quality and competitive price, welcome any inquiry!! A Basic requirements of choosing cross-linked polyethylene (XLPE) insulating power cable 1. Cable core temperature maximum operating current is applied, shall not exceed the allowable value of the continuous operating current loop cable core temperature must not exceed the permissible values listed in section 2.4 of Schedule that cross-linked polyethylene (XLPE) insulating power cable core maximum rated temperature is 90 ℃. 2. The maximum short-circuit current thermal effects produced by the role of time, should not undermine the continued use of the cable characteristics. For non-fuse protection circuit, according to the short-circuit current core temperature does not exceed a Linear Section 2.4 of the Schedule are allowable values, namely cross-linked polyethylene (XLPE) insulating power cable cores maximum temperature of 250 ℃. 3. Circuit connection is very long, the limits for voltage drop should not exceed the allowable value. 4. For longer distances large current loop or more than 35kV high-voltage cable, to meet the three requirements under the premise of economic current density law should press the selection line core cross section, namely the cable core cross section can be determined as follows                  A=Iy·max/J Wherein Y • max-- normal working hours maximum continuous operating current, A; J-- economic current density, A / mm2.

RHH/RHW-2 XLP/USE Overview

XLP USE building wire is the underground service entrance cable. It has an outstanding ability to survive the pressure. XLP USE cable has oil resistance and gas resistance. Moreover, black USE cables are also resistant to sunlight. Underground service entrance cable is perfect for the application in the industrial setting that requires water resistance. The XLP USE wire can be used as RHH and RHW-2 in both wet and dry industrial environments. XLP USE building cable is mostly used for power distribution in underground service. The voltage rating of USE-2 cable is 600V.

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Features of RHH/RHW-2 XLP/USE

XLP USE building wire is often referred to as RHH/RHW, which indicates the fact that it meets UL standard 854 for underground service entrance cables. RHW is the underground service wire for burial. The letters of the name 'RHW' stand for the different characteristics of the cable. 

The letter 'R' stands for the rubber installation of the cable. The cross-linked polyethylene (XLPE) insulates this type of cables. It makes it resistant to extreme heat, sunlight, and moisture. Aside from rubber, RHW cables can incorporate other types of neoprene insulations. The letter 'H' indicates heat resistance up to 75°C. 'W' stands for water resistance, which indicates that the cables can be put into water. RHW-2 is the subtype of the RHW cable that has a higher heat resistance of 90°C.

RHH is the underground service wire similar to RHW/RHW-2 when it comes to most characteristics. The 'HH' in its name means that it has a high heat resistance of 90°C. Unfortunately, RHH cables do not possess water resistance. Therefore, they are suitable for use in dry settings only.

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Type RHH or RHW-2 or USE-2 can be used differently according to the specifications provided in the National Electrical Code. When the cable is used as XLP USE-2 aluminum building wire, it is designed for direct burial with temperatures not exceeding 90°C. When used as RHH, the maximum temperature remains the same, but the location should be exclusively dry. As RHW-2, the cable applies to both wet and dry locations.

XLP USE-2 aluminum building wire vs. XLP USE-2 copper conductor

XLP USE  is sold with both aluminum and copper conductors. XLP USE-2 copper wire is more popular than XLP USE-2 aluminum wire today. However, the latter is sold at a lower price than the XLP USE-2 copper version. The carrying power of the XLP USE-2 aluminum wire is lower while the impedance is generally higher. A difference in price can serve as a criterion for choosing either aluminum or copper. 

There is no reason to suggest that the XLP USE-2 copper conductor is superior to the aluminum version as both have strengths and pitfalls. The copper cable does not require a large conduit and needs less insulation. XLP USE-2 aluminum building wire has a larger diameter than its copper counterpart, which can be a disadvantage in some circumstances. Aluminum cables are more flexible, whereas copper ones are more energy-saving. Though there are subtle differences in the way aluminum and copper wires perform, both materials are effectively used for underground service entrance cable. You can choose the cable that is right for you based on the specifications of your project.

XLP USE cable performs well within the range of the specific applications that it is designed for. Regardless of whether one chooses an aluminum or copper version, excellent performance is guaranteed. The product is suitable for industrial, residential, and commercial applications.

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